Sampling device



Feb. 27, 5 J RQBlsON SAMPLING DEVI CE Filed April 30, 1943 INVENTdR:

5/0/vEY J. ZB/SON,

BY: 2 ATTO EY Patented Feb. 27, 1945 SAMPLING DEVICE Sidney J. Roblson,New York, N. Y., assignor to Universal Atlas Cement Company, acorporation of Indiana Application April 30, 1943, Serial No. 485.251

Claims. (Cl. 73-422) This invention relates to a sampling device' forsampling material which is carried at a high velocity by compressed airpressure through a duct. Cement is often transported by this meth- 0dand it is sometimes necessary to obtain samples of the cement whileflowing through the duct. Since cement is a very fine material, thesampling devices now in common use are not suitable for obtaining thesamples.

It is an object of my invention to provide a sampling device forobtaining samples of cement as it flows through a duct under pressure.

This and other objects will be more apparent after referring to thefollowing specification and attached drawing in which the single figureis a sectional elevation of the sampling device.

Referring more particularly to the drawing, the reference numeral 2indicates a duct through which cement is being carried by compressed airpressure. Welded to the duct 2 is an air tight box 4 to which isattached a detachable sample container 6. The box 4 is fitted with avalve 8. A sampling tube Ill passes through the box 4 and slides in ametal guide l2 welded to the duct 2 and also through a packed gland orguide l4 welded to the box 4. The top of the tube I0 is closed by meansof a plug l6 and a second plug I8 is inserted in the tube It somedistance irom the end thereof. thus forming a passageway 20 having aninlet 22 below the plug I6 and an outlet 24 above the plug l8. A spring24 surrounds the lower end of the tube l0 and tends to hold the tube ina retracted position by exerting pressure on an abutment 34 attachedthereto. The tube I0 is raised and lowered by a connecting rod 26 whichis actuated by a cam 28 driven by a motor 30 through a speed reducer 32.

The operation of the device is as follows:

In its normal or retracted position, the top of the tube is flush withthe upper surface of guide l2. When it is desired to obtain a sample ofcement. the motor 30 is actuated to rotate the cam 28, thus raising theconnecting rod 26 and compressing the spring 24 betweenan abutment 36 onthe guide I4 and the abutment 34 fastened to the tube Ill. The valve 8is opened to permit a certain amount of air to escape from the samplingcontainer 4 so that there will be a flow of air and material through thesampling tube. By varying the amount of air escaping from the container4. the pressure inside the sampling tube is changed, thus controllingthe rate of flow of the air through the sampling tube and the amount ofcement drawn from the duct Ill) 2 at each stroke or the sampler. Themotor 30 is then actuated to lower the tube In into retracted position,the spring 24 forcing the tube downwardly as the cam 28 rotates. Thesample container 6 is detached from the box 4 and a new sample containerS substituted therefor. If desired, the motor 30 may be controlled by atiming switch which will operate at predetermined intervals to thrustthe tube l0 upwardly into the stream of the material flowing from theduct 2 and to retract it to its normal position.

While one embodiment of the invention has been shown and described, itwill be apparent that other adaptations and modifications may be madewithout departing from the scope of the attached claims.

I claim:

1. A device for sampling material carried by air pressure in a ductcomprising a sealed box attached to said duct, said duct having anopening therein, a guide fastened to said duct, a guide attached to saidbox, a sampling tube mounted in said guides extending through the boxfrom the exterior thereof and movable through the opening in the ductand having a passageway placing the duct and box in communication witheach other when the tube is extended into the duct, means for movingsaid tube into and out of said duct, and means for permitting air toescape from said box to cause flow of said material from said ductthrough said tube into said box when the sampling tube is incommunication with said duct.

2. A device for sampling material carried by air pressure in a ductcomprising a sealed box attached to said duct, said duct having anopening therein, a guide fastened to said duct, a guide attached to saidbox, a sampling tube mounted in said guides extending through the boxfrom the exterior thereof and movable through said opening, said tubehaving a passageway with an inlet in communication with said duct and anoutlet in communication with said box when the tube is extended into theduct, means for moving said tube into and out of said duct, and meansfor permitting air to escape from said box to cause flow of saidmaterial from said duct through said passageway into said box when theinlet of said passageway is in communication with said duct.

3. A device for sampling material carried by air pressure in a ductcomprising a sealed box attached to said duct, said duct having anopenins therein, a container for the sample detchably mounted on saidbox, a guide fastened to said duct, a guide attached to said box, asamling tube mounted in said guides extending through the box from theexterior thereof and movable through said opening, said tube having apassageway with an inlet in communication with said duct and an outletin communication with said box when the tube is extended into the duct,means {or moving said tube into and out of said duct, and a valve forpermitting air to escape from said box to cause flow of said materialfrom said duct through said passageway into said box when the inlet ofsaid passageway is in communication with said duct.

4. A device for sampling material carried by air pressure in a ductcomprising a sealed box connected to said duct, said duct having anopening therein communicating with said box, a sampling tube in said boxmovable through said opening and having a passageway which places theduct and box in communication with each other when the tube is extendedinto the duct. means controlled from outside the box for movin: saidtube into and out of said duct, and

means for permitting air to escape from said box to cause flow ofmaterial from said duct through said tube into said box when thesampling tube is in communication with said duct.

5. A device for sampling material carried by air pressure in a ductcomprising a sealed box connected to said duct, said duct having anopenins therein communicating with said box, a container for said sampledetachably mounted on said box, a sampling tube in said box movablethrough said opening and having a passageway which places the duct andbox in communication with each other when the tube is extended into theduct, means controlled from outside the box for moving said tube intoand out of said duct, and means for permitting air to escape from saidbox to cause flow of material from said duct through said tube into saidbox when the sampling tube is in communication with said duct.

SIDNEY J. ROBISON.

